PHP 5.6.0 released

pclose

(PHP 4, PHP 5)

pclose关闭进程文件指针

说明

int pclose ( resource $handle )

关闭用 popen() 打开的指向管道的文件指针。

参数

handle

文件指针必须有效,且必须是成功调用 popen() 所返回的。

返回值

返回运行的进程的终止状态。发生错误时会返回 -1

范例

Example #1 pclose() 例子

<?php
$handle 
popen('/bin/ls''r');
pclose($handle);
?>

注释

Note: Unix Only:

proc_close() is internally implemented using the waitpid(3) system call. To obtain the real exit status code the pcntl_wexitstatus() function should be used.

参见

  • popen() - 打开进程文件指针

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User Contributed Notes 3 notes

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1
Mike
6 years ago
The termination status, as pointed out in another note, is not the same as the exit status from the process. However, something like "pclose($fp)/256" is not the correct way to extract the exit status, since this uses system- and version-specific knowledge of where in the termination status the exit status is stored. (Also, the process may not even have exited normally, so it may not have an exit status at all.)

Instead, the functions pcntl_wifexited() and pcntl_wexitstatus() should be used. They are wrappers for the C macros WIFEXITED() and WEXITSTATUS() that are designed for determining whether the process had an exit status and what that status was, respectively.
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1
vdweij at mailsurf dot com
11 years ago
As I understand pclose will return 0 (on every platform) in case popen could not execute the specified command.

Since popen only returns the status wether it was able to send a command and not wether it was succesfully executed. Only the returned value of pclose can be used to check wether a command could be executed.
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0
kcross at nssolutions dot com
11 years ago
Somewhere between 4.1.1 and 4.2.3, the return value from pclose changed.

The exit status used to be in the second byte, so that the status would be (pclose($fp)/256).

It is now in the low-order byte, so the status is just pclose($fp).

Be careful.
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